Apparatus for forming single faced corrugated boards



Dec. 26, 1967 D. CANNADY APPARATUS 'FOR FORMING SINGLE FACED CORRUGATED BOARDS Filed June 29, 1964 m T N v V W DONALD L..CANNADY M %e M Fla; 4

ATTORNEYS United States Patent 3,360,419 APPARATUS FOR FORMING SINGLE FACED I CORRUGATED BOARDS Donald L. Canuady, Jacksonville, Fla., assignor to Owenslllinois Glass Company, a corporation of Ohio Filed June 29, 1964, Ser. No. 378,679 4 Claims. (Cl. 156-473) ABSTRACT OF THE DISCLOSURE This application discloses a corrugating machine for making corrugated paperboard in which the curved guides for guiding the corrugated web on the corrugating roll are provided with converging side wings for funneling adhesive from the tips of the corrugated web onto the portion of the tips of the web which are masked by the guides, thereby to produce corrugated paperboard without dry streaks.

This invention relates to apparatus for forming single faced corrugated paperboard.

, More particularly, this invention relates to apparatus for forming corrugated paperboard, wherein the facing is applied to the corrugations by adhesives without the usual dry streaks caused by the conventional paper guides.

. In the production of corrugated paperboard, particularly of the single face type, it is desirable that the facing be adheredrto the crests of the corrugation throughout the, entire width of' the board by uniform application of adhesives to the crests and then applying a liner to the adhesive carrying crests.

As is well known, the corrugating rolls which form the corrugations are the type which in the normal process are heated so as to dry the paper and in the drying process the paper becomes somewhat set in its corrugating configuration.

- In order that the corrugated paper become uniformly formed it has been found necessary to maintain the corrugated paper in the corrugations of the corrugator roll for as long as possible in its travel to effect the desired drying and also to retain the shape of the corrugations as to their uniformity for as long as possible.

With this in mind, it is the present practice to use spaced-apart paper guides which have an .arcuate shape paralleling the circumference of the corrugated roll and to' utilize the paper guides to hold the corrugated paper in the corrugations of the roll until such time as the corrugated paper. is applied to the liner.

It is also now common practice to apply the adhesive to the crests of the corrugated paper while the paper is maintained in contact with one of the corrugating rolls. This has been accomplished in the past by providing an adhesive roll which is driven in contact with the paper carried by the corrugated roll. However, it was found that when producing corrugated paper of a width less than the full width of the corrugated roll, it was desirable not to have the adhesives applied to the bare corrugated roll, from the standpoint that it produces an undesirable condition requiring later cleaning.

With this in mind, and as taught in US. [Patent No. 1,106,502, dated Aug. 11, 1914, a system was devised wherein the adhesive roll was spaced from the corrugating roll and the paper guides were formed such that the paper would fluff out against the adhesive roll and then in this manner the adhesive would be applied to the crests of the corrugated paper. It can readily be appreciated that this system has certain disadvantages from the standpoint that the flufiing out or separation of the paper from the corrugator roll requires the fingers or guides to push the paper back into the corrugated roll after the application of the adhesive. This disturbs the uniformity of the corrugations of the paper and in some instances has resulted in tearing the corrugated paper resulting in an unsatisfactory product, down time and loss of continuous production. Even in the prior art systems wherein glue fingers or paper guides have been used, it should be readily appreciated that the area of the corrugated paper which is in contact with the paper guide will not have any adhesive applied thereto and the resultant single face paperboard will have what are termed dry streaks. Dry streaks are where the adhesive is not present between the crests of the corrugated paper and the-liner paper.

The present invention is concerned with the forming of corrugated paperboard on a continuous basis, wherein the dry streak condition is eliminated thus resulting in a product which is superior in strength and durability to that presently formed wherein dry streaks are the accepted condition.

In view of the foregoing, it is an object of this invention to provide apparatus for forming single faced corrugated board wherein the adhesive is uniformly applied to the crests of the corrugated paper throughout its entire width.

It is an additional object of this invention to provide a new paper guide which does not interfere with the application of adhesives to the crests of the corrugated paper.

It is a further object of this invention to provide a paper guide having adhesive conducting means formed integral therewith for assuring uniform adhesive application to the crests of the corrugated paper.

Other and further objects will be apparent from the following description taken in conjunction with the annexed sheet of drawings, wherein:

FIG. 1 is a diagrammatic view showing the operations of a conventional corrugating process; 7

FIG. 2 is a partial view on an enlarged scale of the portion of FIG. 1 showing the detailed arrangement of the adhesive applying roll and the corrugating roll;

FIG. 3 is a plan view of the paper guide of the invention; and,

FIG. 4 is a side elevational view of FIG. 3.

With reference to the drawings, the apparatus of the of the paper guide invention will now be described in detail.

A pair of corrugator rolls 10 and 11 have precisely formed surfaces which intermesh so that as the corrugating medium or paper 12 is fed between the intermeshing rolls 10 and 11, it will be corrugated. A liner sheet 18, which comes-from a suitable source of supply (not shown), passes around a heated pressure roll 14 which presses the liner sheet '13 against the crests of the corrugations of the corrugated sheet or corrugated medium just before the corrugated sheet 12 leaves the bottom corrugating roll 11. The liner sheet 13 is fixed to the corrugated sheet 12 by means of an adhesive or glue supplied by a glue roll 15 located beneath the bottom corrugating roll 11 in position for applying the glue or adhesive contained in the supply chamber 16 to the crestsof the corrugations of the corrugated sheet as it passes around the bottom corrugating roll 11.

The apparatus is provided with a series of paper guides or glue fingers 17 that are spaced apart longitudinally of the corrugating rolls 10 and 11. The guides 17 are located in annular grooves 18 and 19 formed in the top corrugating roll 10 and glue roll 15 respectively.

The function of the guides 17 is to strip the corrugated sheet 12 from the top corrugating roll 10 and hold the corrugated sheet snugly in the corrugations of the bottom corrugating roll 11 during its travel about the periphery of the roll 11.

Serious drawbacks are presented with respect to the arrangement thus far described, the most serious of which is that it is necessary to have a plurality of guides 17 spaced apart longitudinally of the corrugating rolls and 11 at intervals of from two inches to four inches. This obviously requires annular grooves 18 and 19 formed in the glue roll for accommodating the guides 17. These grooves normally result in a discontinuous glue line across the width of the corrugating medium with resulting loss of bond strength.

Turning now specifically to FIGS. 2-4, wherein the specific structure of the glue fingers or paper guides 17 is disclosed, it can be seen that the glue finger is made up of an arcuate metal member 20 to which are fixed shorter arcuate members 21 and 22. The members 21 and 22 are fixed to opposite sides of the member 20 by riveting or other suitable fastening means.

As can be seen when viewing FIGS. 2 and 4, the short arcuate members 21 and 22 are sloped at one end 23 in such a manner that they closely parallel the curvature of the glue roll 15. This end of the short arcuate members might be considered to be the leading edge of the area immediately following the point of application of the glue to the corrugated medium 12.

The glue roll 15, as can be seen when viewing FIG. 2, applies the glue to the corrugating medium at the point 24 and as the corrugating medium proceeds, with the rotation of the corrugating roll 11 in the direction of the arrow shown thereon, the short arcuate members 21 and 22 at the end 23 thereof will guide a portion of the glue which is applied to the corrugated medium toward the center into alignment with the dry streak area normally caused by the presence of the guide 20 at the point 24 of glue application.

As can be seen when viewing FIG. 3, the members 21 and 22 are bent outwardly in the area 23 so that, in effect, they plough or guide glue which is on the crests of the corrugated medium 12 into the center of the so-called dry streak.

It should also be pointed out that the member 20 is downwardly relieved at 25 so as to present no problem with respect to wiping off of the glue which is moved onto the dry streak area of the crests of the corrugated medium 12.

Thus it can be seen that as the corrugated medium is conveyed past the adhesive roll to the liner applying roll, the outwardly presented tips of the corrugated medium 12 will receive adhesive or glue from the adhesive roll and the guides will funnel adhesive applied to the crests or tips adjacent the guides into the area where the guides originally engaged the crests and since the guide is not a single member, the immediate center of the guide downstream of the point of application of the glue is relieved so that this area may receive glue and retain sufficient to provide adequate adhesive for securing the corrugated medium to the liner.

While the above description has been primarily directed to the forming of single faced corrugated board, it should be obvious that, in the normal operation of forming double faced or double corrugated boards, it is always necessary that the first single face he produced and it is intended that this invention will relate to the forming of double faced or additional wall board of the corrugated type.

Various modifications may be resorted to within the spirit and scope of the appended claims.

I claim:

1. In a machine for making corrugated paperboard, the combination of a corrugated roll rotatable about an axis and constructed to mesh with a continuous corrugated web for conveying said web past an adhesive roll to a liner-applying roll, an adhesive roll arranged to apply adhesive to the outwardly presented tips of said corrugated web as said web is conveyed thereby around the rotary axis of said corrugated roll, said adhesive roll having grooves, a series of guides received by said grooves and guiding the web on the corrugating roll, said guides having means thereon for funneling adhesive, applied to the tips adjacent the guides, into the area where the guides engage the tips.

2. In a machine for making corrugated paperboard, the combination of a corrugated roll rotatable about an axis and constructed to mesh with a continuous corrugated web for conveying said web past an adhesive roll to a liner-applying roll, an adhesive roll arranged to apply adhesive to the outwardly presented tips of said corrugated web as said web is conveyed thereby around the rotary axis of said corrugated roll, said adhesive roll having grooves, a series of guides received by said grooves and guiding the web on the corrugating roll, said guides having side wings thereon for tunneling adhesive, applied to the tips adjacent the guides, into the area where the guides engage the tips.

3. In a machine for making corrugated paperboard, the combination of a corrugated roll rotatable about an axis and constructed to mesh with a continuous corrugated web for conveying said web past an adhesive roll to a liner-applying roll, an adhesive roll arranged to apply adhesive to the outwardly presented tips of said corrugated web as said Web is conveyed thereby around the rotary axis of said corrugated roll, said adhesive roll having grooves, and a series of guides received by said grooves and guiding the web on the corrugating roll, said guides comprising arcuate members having a curvature approximating the outer curvature of said corrugated roll and converging side wings carried by said members for tunneling adhesive, applied to the tips adjacent the guides, into the area where the guides engage the tips.

4. In a machine for making corrugated paperboard, the combination of a corrugated roll rotatable about an axis and constructed to mesh with a continuous corrugated web for conveying said web past an adhesive roll to a liner-applying roll, an adhesive roll arranged to apply adhesive to the outwardly presented tips of said corrugated web as said web is conveyed thereby around the rotary axis of said corrugated roll, said adhesive roll having grooves, a series of guides received by said grooves and guiding the web on the corrugating roll, said guides comprising arcuate members having a curvature approximating the outer curvature of the corrugating roll, a pair of outwardly bent side wings connected to opposite sides of each member for tunneling adhesive applied to the tips adjacent the guides, onto the portion of the tips that is masked by the guides and said members having a relieved portion in the area between said side wings.

References Cited UNITED STATES PATENTS 1,106,502 8/1914 Ferres 156-473 1,186,997 6/1916 Langston 156473 3,220,911 11/1965 Werner 156-473 EARL M. BERGERT, Primary Examiner.

H. F. EPSTEIN, Assistant Examiner. 

1. IN A MACHINE FOR MAKING CORRUGATED PAPERBOARD, THE COMBINATION OF A CORRUGATED ROLL ROTATABLE ABOUT AN AXIS AND CONSTRUCTED TO MESH WITH A CONTINUOUS CORRUGATED WEB FOR CONVEYING SAID WEB PAST AN ADHESIVE ROLL TO A LINER-APPLYING ROLL, AN ADHESIVE ROLL ARRANGED TO APPLY ADHESIVE TO THE OUTWARDLY PRESENTED TIPS OF SAID CORRUGATED WEB AS SAID WEB IS CONVEYED THEREBY AROUND THE ROTARY AXIS OF SAID CORRUGATED ROLL, SAID ADHESIVE ROLL HAVING GROOVES, A SERIES OF GUIDES RECEIVED BY SAID GROOVES AND GUIDING THE WEB ON THE CORRUGATING ROLL, SAID GUIDES HAVING MEANS THEREON FOR FUNNELING ADHESIVE, APPLIED TO THE TIPS ADJACENT THE GUIDES, INTO THE AREA WHERE THE GUIDES ENGAGE THE TIPS. 